China declared the largest chunk of territorial waters off its coast open for offshore wind development, as its southernmost province of Hainan inked a deal with renewables giant State Power Investment Corp (SPIC) that could also pave the way for green hydrogen production.

The co-operation agreement foresees SPIC investing in ‘deep-sea’ wind power, hydrogen, energy storage and a clutch of other sectors in the island province, which has so far been a laggard in renewables.

The deal marks a decisive shift in the province’s attitude towards wind power that heralds the opening of a huge area of the South China Sea — Hainan's territorial waters are China's largest spanning 2.1